character: Ms. Sarah Lee
topic: Freshwater Ecosystems and Contaminant Dynamics
grade: 12
subject: Chemistry
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character: Mr. John Smith
topic: Water Quality and Chemical Pollution
grade: 12
subject: Chemistry
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character: Dr. Emily Johnson
topic: Impact of Nutrients on Aquatic Life
grade: 12
subject: Chemistry
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character: Ms. Rachel Green
topic: Chemical Interactions in Freshwater Habitats
grade: 12
subject: Chemistry
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